Improvement in atmospheric-pressure attachments for dental-plates



JAMES P. GILLESPIE, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN ATMOSPHERIC-PRESSURE ATTACHMENTS FOR DENTAL-PLATES.

Specification forming part of Letters Patent No. 115,951, dated June 13, 1871.

ible disk to hold or retain them in place in the mouth, consists in corrugating or grooving the side of the disk next to the plate, or corrugating the plate under the disk, so that the disk will not adhere to the plate by suction.

In the accompanying drawing, Figure 1 is a plan of a dental-plate with the disk attached. Fig. 2 is a section of the same. Fig. 3 is the under side of the disk.

In the drawing, A is a dental-plate, provided with a cavity, 2), to receive the flexible disk a of India rubber or other suitable material. The diskhasa rivet, a, through the center to fasten it to the plate A, as shown in section, Fig. 2. The disk 0. is corrugated or grooved on the under side next to the plate to prevent the disk from adhering to the plate by suction; or the cavity in the plate may be corrugatec'l for the same purpose. The disk at is made small enough to be a little loose in the cavity b, so that its edges will lift freely and easily when the disk adheres to the palate to prevent the plate from dropping from the palate.

1 do not claim, broadly, a dental-plate provided with a flexible disk 5 but What I do claim is- Gorrugating the flexible disk on the side next to the plate, or corrugating the plate under the disk.

JAMES P. GILLESPIE.

Witnesses G. FITZGERALD, GEO. H. STRONG.

JOHN'GOULDING.

g Engines.

Patented junelaJsn.

Improvement in Oscillatin 

